Mechanical movement



March 17, 1925.

J. C. E, BOURASSA MECHANICAL MOVEMENT Filed Dec, 11, 1922 INVEKTOR J.G.E.Bouru.ssa.

Patented Mar. 17, 1925.

u Ni'rEo STATES PATENT OFFICE.

JOSEPH CYRILLE EMILE BOURASSA, 0F MONTEEAL, QUEBEC, CANADA.

MECHANICAL MOVEMENT.

Application filed December 11, 1922. Serial No. 606,217.

The present invention relates to a mechanical movement whereby multiplication of force may be effected within limited space.

It also provides means to vary the direction of applied forces in an eflicient manner or with a very low percentage of friction.

One arrangement which may be employed where a heavy load isto be raised a short elevation or when high multiplied pressure is desired is hereafter described. This consists of a cam of special form which is the main element of the invention, in combination with an articulated link and an abutment shown in the drawings attached, in which- Figure 1 shows the arrangement above mentioned in a closed or lowered position.

Fig. 2 shows the same arrangement in a partly opened or raised position; and

Fig. 3 shows the same in practically its fully opened or raised position.

It will be seen that each figure is accompanied by a diagram in order to compare 7 the resultant of forces.

In the drawings, 1 is a base on which is fixed c1rcular members or axles a and b.

It will be seen that the distance between a' and b is constant in all three figures and in their diagrams, 5 is the link member articulated at its lower end on axle a through antifriction rollers 6 and at its upper end on common member 0. 7 is the cam member pivoted at its upper end 8 on axle c and fitted with antifriction rollers 8. This cam has two active faces, that is, 9 being the a screw or steam or air. pressure. 16 represents a plate intended to support a load or to apply pressure derived through this arrangement. This plate is mounted on common axle c, as better shown in Fig. 3.

a way that it will present at various positions a surfacein a plane approximately perpendicular to rod 13, thereby removing excessive strain on the rod and friction in E its bearings. The curve of face 9 is such that it will present an angle with the abutment Z) in relation to the link 5 inversely proportional to the load on the abutment,

thereby resulting in a faster angular movement of lin: 5. This will also bring the result that the pressure at the plate 16 will remain constant, which is an object ofthe invention.

These facts will be more clearly under-v stood by referring to the diagrams where L represents the load or the resulting pressure; ac represents the line of force of the link5; .c-b, the line' of force between the upper part of the link at 0 and the abutment 6.

In Fig. 1, it will be seen, by referring to the diagram, that the load on the cam is approximately 175 per cent of that on link 5 since O-I-I and OcZ are equal to the lines of force c-b and ca, respectively. The line b-P represents the result of the leverage of the second class between the link 5 and the abutment b. I

In Fig. 2, it will be seen on glancing over lines OII and OcZ, that the load 6-0 .6 The face 10 of the cam 7 is curved in such has decreased to approximately 155 per cent of the load a-c but it will be noticed that the angular movement of a-0 has increased approximately 18 per cent as shown by 6-15. 4

In Fig. 3, it is clear that the link5 is receiving the greater load since O-(Z is greater than O-H, the load on 0-6 being approximately per cent of that of 0-a, or a decrease for 0+6 of 60 percent, but it is also clear, as indicated by line b-P, that the angular movement of ac has increased inversely, leading to the desired result of constant load at 16.

It is thought that, although the illustrations have not been made with exact meas urements, they are clear enough to explain the working and show the difi'erent advantages. i

Were the described arrangement to be replacedby a toggle, two links'corr-esponding to link 5 would have to be coupledend to end, requiring tWice the space, also an un-' versely proportional to the load on said abutment to proportionally"increase the angular movement of said link.

2. In a mechanical 'movement as de scribed, an abutment, a link'member having one endthereof stationary in relation with said abutment, a cam pivoted at the other end of said link member, said cam having an acting face and an acted face, the acting face of said cam resting against the said abutment, and means acting on the acted face of said cam to actuate the same. 3. In a mechanical movement as described, an abutment, a link member, said link member having its axis at one end in fixed relationtothe'sa-id'abutment, a cam pivoted on said link member, saidcam having itsface resting on'said abutment, the angle on-any polnt of thefa-ce of the cam resting on the abutment being constant to the angular plane of the'link member.

4:. In ameohanical movement of the class described, an abutment, a link member, said link member having its axis at one end in fixed relation to the said abutment, a cam having an acting face and an acted face pivoted on said link member,-the angle on any point of the acting face of the said cam resting on the abutment being constant to the angular plane ofthe link member and the acted face at any position of=thecam being in a plane pe-rpendicularto' the line of force actuating said cam.

5. Ina mechanical mOVementw-as described, an abutment, a link member having one end stationary in relation "with said abutment, a cam pivoted at the other end of'said link membeig said cam-having an acting face and an acted face,'the acting face of said cam resting againstthesaid abutment, means acting on the acted face of saidcam to actuate the same; the Working angle of said cam varying inversely proportional to'the load on said abutment to proportionally increase the angular movement of said link-member.

Montreal, Quebec, this 25th day of November, 1922.

Doms H. OORRIGAN, MARION E. VIAN. 

